As a newbie, you don't need to go in dept of Bitcoin understanding before investing, just only the basics needed, Jjg has made it clear in one of his lecture that
One of the most important things to know before investing into bitcoin is whether or not you have a discretionary income or not. If you have a discretionary income, then you can get started, and learn various aspects as you go, including self-custody.
Surely, the more you invest into bitcoin the more you likely need to know in advance, yet you can still get started and study in order to figure out if you are putting in $10 per week or $100 per week, or $1k per week or even if you might want to start with lump summing with $10k or more. The more you put in the more that you likely need to know, yet at the same time, different people earn differing amounts, so if a guy is earning $100k or more a year, then he likely has more options than a guy who is earning $6k or less per year
Of course bitcoin is not too complex that one can not comprehend the little things about it then to invest in it, it's as simple as every other investments that you need to know the basics and the probability that one could make some kind of profit hence it's as simple as simple as that. Bitcoin basics just as you mentioned are just the mere fact that you can invest without inconveniencing yourself too much even though cutting down some expenses might be needed yet it's as important as that. Once you can sort out all this then there is nothing much for you to think of before investing into bitcoin.